#!/bin/sh

ROOT_UID=0							# Only users with $UID 0 have root privileges.
E_NOTROOT=67							# Non-root exit error.

# Run as root, of course.
if [ "$UID" -ne "$ROOT_UID" ]; then
  echo "Must be root to run this script."
  exit $E_NOTROOT
fi

mount /mnt/backup

# full and incremental backup script
# created 07 February 2000
# Based on a script by Daniel O'Callaghan <danny@freebsd.org>
# and modified by Gerhard Mourani <gmourani@videotron.ca>

#Change the 5 variables below to fit your computer/backup

COMPUTER=`hostname -s`						# name of this computer
DIRECTORIES="/home /etc /var"					# directoris to backup
EXCLUDES="--exclude=var/run/*"					# directoris to excludes
BACKUPDIR=/mnt/backup						# where to store the backups
TIMEDIR=/mnt/backup/last-full					# where to store time of full backup
TAR=/bin/tar							# name and locaction of tar
OPTIONS="--selinux --sparse"					# tar options

# Does lzop package exists?
rpm_lzop=`rpm -q lzop`
if [ $? -eq 0 ]; then # Test exit status of "rpm" command.
  OPTIONS="--selinux --sparse --use-compress-program=lzop"
else
  echo Need to install the lzop package when time permits to compress the backups
fi

#You should not have to change anything below here

PATH=/usr/local/bin:/usr/bin:/bin
DOW=`date +%a`             				 	# Day of the week e.g. Mon
DOM=`date +%d`             				 	# Date of the Month e.g. 27
DM=`date +%d%b`							# Date and Month e.g. 27Sep

# On the 1st of the month a permanet full backup is made
# Every Sunday a full backup is made - overwriting last Sundays backup
# The rest of the time an incremental backup is made. Each incremental
# backup overwrites last weeks incremental backup of the same name.
#
# if NEWER = "", then tar backs up all files in the directories
# otherwise it backs up files newer than the NEWER date. NEWER
# gets it date from the file written every Sunday.


# Monthly full backup
if [ $DOM = "01" ]; then
        NEWER=""
        $TAR $OPTIONS $NEWER -cpf $BACKUPDIR/$COMPUTER-$DM.tar $DIRECTORIES $EXCLUDES
fi

# Weekly full backup
if [ $DOW = "Sun" ]; then
        NEWER=""
        NOW=`date +%d-%b`

        # Update full backup date
        echo $NOW > $TIMEDIR/$COMPUTER-full-date
        $TAR $OPTIONS $NEWER -cpf $BACKUPDIR/$COMPUTER-$DOW.tar $DIRECTORIES $EXCLUDES

# Make incremental backup - overwrite last weeks
else

        # Get date of last full backup
        NEWER="--newer `cat $TIMEDIR/$COMPUTER-full-date`"
        $TAR $OPTIONS $NEWER -cpf $BACKUPDIR/$COMPUTER-$DOW.tar $DIRECTORIES $EXCLUDES
fi

umount /mnt/backup